The main problem is not that you can go to center of galaxy really quick, the problem is after you explore around 20 planets, you will see a pattern. And it will get old very fast. The game relies on being repetitive. There are alot of monster types, but some of them share the same actions. Same with planets really, you explore a few, and you will see the same one over and over (not 100% same, but similar what I meant at the beginning).
If you hate repetitive games (such as NMS), you will not find this game fun. If they handcrafted that so called 4 quintillion planets, animals and such, the game would never ever release.